gistfile1.sh

bsmith bundler (1-0-stable) $ grep -n -r "no-cache" ./
./lib/bundler/cli.rb:139:    method_option "no-cache", :type => :boolean, :banner =>
bsmith bundler (1-0-stable) $ grep -n -r "no_cache" ./
bsmith bundler (1-0-stable) $

bsmith bundler (1-0-stable) $ git log --oneline | grep "no-cache"
4601dde Add install option --no-cache to prevent updating the cache.
e4287d2 Add install option --no-cache to prevent updating the cache.
bsmith bundler (1-0-stable) $ git show 4601dde
commit 4601ddeaaddf2671ecc2baa24f49d9e59e7fcfcb
Author: Andre Arko <andre@arko.net>
Date:   Wed May 12 13:52:34 2010 -0700

    Add install option --no-cache to prevent updating the cache.

diff --git a/lib/bundler/cli.rb b/lib/bundler/cli.rb
index ef9ca0d..b8048e3 100644
--- a/lib/bundler/cli.rb
+++ b/lib/bundler/cli.rb
@@ -85,8 +85,10 @@ module Bundler
       "Do not use any shared gems, such as the system gem repository."
     method_option "gemfile", :type => :string, :banner =>
       "Use the specified gemfile instead of Gemfile"
-    method_option "no-prune",  :type => :boolean, :banner =>
+    method_option "no-prune", :type => :boolean, :banner =>
       "Don't remove stale gems from the cache."
+    method_option "no-cache", :type => :boolean, :banner =>
+      "Don't update the existing gem cache."
     def install(path = nil)
       opts = options.dup
       opts[:without] ||= []
bsmith bundler (1-0-stable) $ git show e4287d2
commit e4287d26ad52b4db5c6379432dd201bf1a0eb311
Author: Andre Arko <andre@arko.net>
Date:   Wed May 12 13:52:34 2010 -0700

    Add install option --no-cache to prevent updating the cache.

diff --git a/lib/bundler/cli.rb b/lib/bundler/cli.rb
index 0fff900..847dd05 100644
--- a/lib/bundler/cli.rb
+++ b/lib/bundler/cli.rb
@@ -72,6 +72,7 @@ module Bundler
     method_option "relock",  :type => :boolean, :banner => "Unlock, install the gems, and relock."
     method_option "disable-shared-gems", :type => :boolean, :banner => "Do not use any shared gems, such as the system gem repository."
     method_option "gemfile", :type => :string, :banner => "Use the specified gemfile instead of Gemfile"
+    method_option "no-cache",  :type => :boolean, :banner => "Don't update the existing gem cache."
     method_option "no-prune",  :type => :boolean, :banner => "Don't remove stale gems from the cache."
     def install(path = nil)
       opts = options.dup
@@ -94,7 +95,7 @@ module Bundler
       end
 
       lock if options[:relock]
-      cache if Bundler.root.join("vendor/cache").exist?
+      cache if Bundler.root.join("vendor/cache").exist? && !options[:no_cache]
       Bundler.ui.confirm "Your bundle is complete! " +
         "Use `bundle show [gemname]` to see where a bundled gem is installed."
     rescue GemNotFound => e

The method_option reference is for Thor to understand the option, but the option never seems to get referenced. The underscored no_cache is in case it is referenced as a symbol (and the dash gets changed to an underscore).